ARM: tegra: tamonten: add the display to the Medcom Wide

Enable the RGB output and add the panel definition to the Medcom Wide
DTS. Also add a label to the backlight defintion to reference it in
the panel definition.
Signed-off-by: Alban Bedel <alban.bedel@avionic-design.de>
Signed-off-by: Stephen Warren <swarren@nvidia.com>

arch/arm/boot/dts/tegra20-medcom-wide.dts

@@ -10,6 +10,15 @@ pwm@7000a000 {
 		status = "okay";
 	};
 
+	host1x@50000000 {
+		dc@54200000 {
+			rgb {
+				status = "okay";
+				nvidia,panel = <&panel>;
+			};
+		};
+	};
+
 	i2c@7000c000 {
 		wm8903: wm8903@1a {
 			compatible = "wlf,wm8903";
@@ -30,7 +39,7 @@ wm8903: wm8903@1a {
 		};
 	};
 
-	backlight {
+	backlight: backlight {
 		compatible = "pwm-backlight";
 		pwms = <&pwm 0 5000000>;
 
@@ -38,6 +47,15 @@ backlight {
 		default-brightness-level = <6>;
 	};
 
+	panel: panel {
+		compatible = "innolux,n156bge-l21", "simple-panel";
+
+		power-supply =  <&vdd_1v8_reg>, <&vdd_3v3_reg>;
+		enable-gpios = <&gpio TEGRA_GPIO(B, 2) GPIO_ACTIVE_HIGH>;
+
+		backlight = <&backlight>;
+	};
+
 	sound {
 		compatible = "ad,tegra-audio-wm8903-medcom-wide",
 			     "nvidia,tegra-audio-wm8903";